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Figure 1: Left nephrostogram showing persistent focal narrowing in the proximal ureter (black arrow) with proximal hydroureteronephrosis. Central pooling of contrast is seen in interpole medulla (white arrow) giving the egg-in-a cup appearance

Figure 1: Left nephrostogram showing persistent focal narrowing in the proximal ureter (black arrow) with proximal hydroureteronephrosis. Central pooling of contrast is seen in interpole medulla (white arrow) giving the egg-in-a cup appearance